Mercurial > hg > graal-jvmci-8
annotate jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotVMConfigAccess.java @ 23700:9e1235406b59
[Findbugs] various warnings reported for JVMCI sources (JDK-8159613)
author | Doug Simon <doug.simon@oracle.com> |
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date | Sat, 18 Jun 2016 13:19:01 +0200 |
parents | 50465926fbeb |
children | 724fbad94ee3 |
rev | line source |
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1 /* |
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2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 package jdk.vm.ci.hotspot; |
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24 |
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25 import jdk.vm.ci.common.JVMCIError; |
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26 |
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27 /** |
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28 * Access to VM configuration data. |
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29 */ |
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30 public class HotSpotVMConfigAccess { |
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31 |
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32 /** |
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33 * Gets the address of a C++ symbol. |
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34 * |
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35 * @param name name of C++ symbol |
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36 * @param notPresent if non-null and the symbol is not present then this value is returned |
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37 * @return the address of the symbol |
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38 * @throws JVMCIError if the symbol is not present and {@code notPresent == null} |
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39 */ |
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40 public long getAddress(String name, Long notPresent) { |
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41 Long entry = store.vmAddresses.get(name); |
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42 if (entry == null) { |
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43 if (notPresent != null) { |
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44 return notPresent; |
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45 } |
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46 throw new JVMCIError("expected VM symbol not found: " + name); |
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47 } |
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48 return entry; |
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49 } |
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50 |
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51 /** |
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52 * Gets the address of a C++ symbol. |
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53 * |
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54 * @param name name of C++ symbol |
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55 * @return the address of the symbol |
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56 * @throws JVMCIError if the symbol is not present |
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57 */ |
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58 public long getAddress(String name) { |
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59 return getAddress(name, null); |
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60 } |
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61 |
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62 /** |
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63 * Gets the size of a C++ type. |
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64 * |
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65 * @param name name of the type |
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66 * @return the size in bytes of the requested field |
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67 * @throws JVMCIError if the field is not present and {@code notPresent} is null |
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68 */ |
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69 public int getTypeSize(String name) { |
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70 Long entry = store.vmTypeSizes.get(name); |
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71 if (entry == null) { |
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72 throw new JVMCIError("expected VM type not found: " + name); |
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73 } |
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74 return (int) (long) entry; |
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75 } |
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76 |
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77 /** |
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78 * Gets the value of a C++ constant. |
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79 * |
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80 * @param name name of the constant (e.g., {@code "frame::arg_reg_save_area_bytes"}) |
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81 * @param type the boxed type to which the constant value will be converted |
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82 * @param notPresent if non-null and the constant is not present then this value is returned |
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83 * @return the constant value converted to {@code type} |
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84 * @throws JVMCIError if the constant is not present and {@code notPresent == null} |
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85 */ |
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86 public <T> T getConstant(String name, Class<T> type, T notPresent) { |
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87 Long c = store.vmConstants.get(name); |
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88 if (c == null) { |
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89 if (notPresent != null) { |
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90 return notPresent; |
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91 } |
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92 throw new JVMCIError("expected VM constant not found: " + name); |
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93 } |
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94 return type.cast(convertValue(name, type, c, null)); |
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95 } |
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96 |
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97 /** |
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98 * Gets the value of a C++ constant. |
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99 * |
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100 * @param name name of the constant (e.g., {@code "frame::arg_reg_save_area_bytes"}) |
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101 * @param type the boxed type to which the constant value will be converted |
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102 * @return the constant value converted to {@code type} |
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103 * @throws JVMCIError if the constant is not present |
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104 */ |
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105 public <T> T getConstant(String name, Class<T> type) { |
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106 return getConstant(name, type, null); |
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107 } |
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108 |
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109 /** |
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110 * Gets the offset of a non-static C++ field. |
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111 * |
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112 * @param name fully qualified name of the field |
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113 * @param type the boxed type to which the offset value will be converted (must be |
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114 * {@link Integer} or {@link Long}) |
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115 * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"}) |
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116 * @param notPresent if non-null and the field is not present then this value is returned |
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117 * @return the offset in bytes of the requested field |
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118 * @throws JVMCIError if the field is static or not present and {@code notPresent} is null |
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119 */ |
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120 public <T> T getFieldOffset(String name, Class<T> type, String cppType, T notPresent) { |
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121 assert type == Integer.class || type == Long.class; |
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122 VMField entry = getField(name, cppType, notPresent == null); |
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123 if (entry == null) { |
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124 return notPresent; |
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125 } |
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126 if (entry.address != 0) { |
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127 throw new JVMCIError("cannot get offset of static field " + name); |
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128 } |
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129 return type.cast(convertValue(name, type, entry.offset, cppType)); |
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130 } |
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131 |
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132 /** |
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133 * Gets the offset of a non-static C++ field. |
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134 * |
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135 * @param name fully qualified name of the field |
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136 * @param type the boxed type to which the offset value will be converted (must be |
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137 * {@link Integer} or {@link Long}) |
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138 * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"}) |
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139 * @return the offset in bytes of the requested field |
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140 * @throws JVMCIError if the field is static or not present |
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141 */ |
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142 public <T> T getFieldOffset(String name, Class<T> type, String cppType) { |
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143 return getFieldOffset(name, type, cppType, null); |
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144 } |
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145 |
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146 /** |
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147 * Gets the offset of a non-static C++ field. |
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148 * |
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149 * @param name fully qualified name of the field |
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150 * @param type the boxed type to which the offset value will be converted (must be |
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151 * {@link Integer} or {@link Long}) |
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152 * @return the offset in bytes of the requested field |
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153 * @throws JVMCIError if the field is static or not present |
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154 */ |
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155 public <T> T getFieldOffset(String name, Class<T> type) { |
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156 return getFieldOffset(name, type, null, null); |
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157 } |
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158 |
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159 /** |
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160 * Gets the address of a static C++ field. |
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161 * |
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162 * @param name fully qualified name of the field |
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163 * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"}) |
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164 * @param notPresent if non-null and the field is not present then this value is returned |
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165 * @return the address of the requested field |
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166 * @throws JVMCIError if the field is not static or not present and {@code notPresent} is null |
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167 */ |
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168 public long getFieldAddress(String name, String cppType, Long notPresent) { |
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169 VMField entry = getField(name, cppType, notPresent == null); |
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170 if (entry == null) { |
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171 return notPresent; |
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172 } |
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173 if (entry.address == 0) { |
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174 throw new JVMCIError(name + " is not a static field"); |
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175 } |
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176 return entry.address; |
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177 } |
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178 |
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179 /** |
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180 * Gets the address of a static C++ field. |
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181 * |
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182 * @param name fully qualified name of the field |
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183 * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"}) |
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184 * @return the address of the requested field |
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185 * @throws JVMCIError if the field is not static or not present |
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186 */ |
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187 public long getFieldAddress(String name, String cppType) { |
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188 return getFieldAddress(name, cppType, null); |
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189 } |
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190 |
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191 /** |
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192 * Gets the value of a static C++ field. |
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193 * |
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194 * @param name fully qualified name of the field |
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195 * @param type the boxed type to which the constant value will be converted |
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196 * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"}) |
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197 * @param notPresent if non-null and the field is not present then this value is returned |
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198 * @return the value of the requested field |
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199 * @throws JVMCIError if the field is not static or not present and {@code notPresent} is null |
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200 */ |
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201 public <T> T getFieldValue(String name, Class<T> type, String cppType, T notPresent) { |
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202 VMField entry = getField(name, cppType, notPresent == null); |
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203 if (entry == null) { |
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204 return notPresent; |
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205 } |
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206 if (entry.value == null) { |
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207 throw new JVMCIError(name + " is not a static field"); |
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208 } |
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209 return type.cast(convertValue(name, type, entry.value, cppType)); |
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210 } |
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211 |
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212 /** |
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213 * Gets the value of a static C++ field. |
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214 * |
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215 * @param name fully qualified name of the field |
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216 * @param type the boxed type to which the constant value will be converted |
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217 * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"}) |
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218 * @return the value of the requested field |
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219 * @throws JVMCIError if the field is not static or not present |
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220 */ |
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221 public <T> T getFieldValue(String name, Class<T> type, String cppType) { |
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222 return getFieldValue(name, type, cppType, null); |
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223 } |
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224 |
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225 /** |
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226 * Gets the value of a static C++ field. |
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227 * |
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228 * @param name fully qualified name of the field |
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229 * @param type the boxed type to which the constant value will be converted |
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230 * @return the value of the requested field |
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231 * @throws JVMCIError if the field is not static or not present |
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232 */ |
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233 public <T> T getFieldValue(String name, Class<T> type) { |
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234 return getFieldValue(name, type, null, null); |
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235 } |
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236 |
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237 /** |
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238 * Gets a C++ field. |
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239 * |
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240 * @param name fully qualified name of the field |
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241 * @param cppType if non-null, the expected C++ type of the field (e.g., {@code "HeapWord*"}) |
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242 * @param required specifies if the field must be present |
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243 * @return the field |
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244 * @throws JVMCIError if the field is not present and {@code required == true} |
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245 */ |
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246 private VMField getField(String name, String cppType, boolean required) { |
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247 VMField entry = store.vmFields.get(name); |
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248 if (entry == null) { |
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249 if (!required) { |
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250 return null; |
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251 } |
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252 throw new JVMCIError("expected VM field not found: " + name); |
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253 } |
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254 |
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255 // Make sure the native type is still the type we expect. |
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256 if (cppType != null && !cppType.equals(entry.type)) { |
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257 throw new JVMCIError("expected type " + cppType + " but VM field " + name + " is of type " + entry.type); |
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258 } |
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259 return entry; |
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260 } |
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261 |
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262 /** |
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263 * Gets a VM flag value. |
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264 * |
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265 * @param name name of the flag (e.g., {@code "CompileTheWorldStartAt"}) |
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266 * @param type the boxed type to which the flag's value will be converted |
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267 * @return the flag's value converted to {@code type} or {@code notPresent} if the flag is not |
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268 * present |
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269 * @throws JVMCIError if the flag is not present |
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270 */ |
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271 public <T> T getFlag(String name, Class<T> type) { |
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272 return getFlag(name, type, null); |
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273 } |
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274 |
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275 /** |
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276 * Gets a VM flag value. |
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277 * |
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278 * @param name name of the flag (e.g., {@code "CompileTheWorldStartAt"}) |
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279 * @param type the boxed type to which the flag's value will be converted |
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280 * @param notPresent if non-null and the flag is not present then this value is returned |
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281 * @return the flag's value converted to {@code type} or {@code notPresent} if the flag is not |
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282 * present |
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283 * @throws JVMCIError if the flag is not present and {@code notPresent == null} |
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284 */ |
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285 public <T> T getFlag(String name, Class<T> type, T notPresent) { |
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286 VMFlag entry = store.vmFlags.get(name); |
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287 if (entry == null) { |
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288 if (notPresent != null) { |
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289 return notPresent; |
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290 } |
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291 throw new JVMCIError("expected VM flag not found: " + name); |
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292 } |
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293 return type.cast(convertValue(name, type, entry.value, entry.type)); |
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294 } |
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295 |
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296 private static <T> Object convertValue(String name, Class<T> toType, Object value, String cppType) throws JVMCIError { |
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297 if (toType == Boolean.class) { |
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298 if (value instanceof String) { |
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299 return Boolean.valueOf((String) value); |
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300 } else if (value instanceof Boolean) { |
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301 return value; |
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302 } else if (value instanceof Long) { |
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303 return ((long) value) != 0; |
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304 } |
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305 } else if (toType == Byte.class) { |
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306 if (value instanceof Long) { |
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307 return (byte) (long) value; |
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308 } |
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309 } else if (toType == Integer.class) { |
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310 if (value instanceof Integer) { |
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311 return value; |
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312 } else if (value instanceof Long) { |
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313 return (int) (long) value; |
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314 } |
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315 } else if (toType == Long.class) { |
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316 return value; |
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317 } |
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318 |
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319 throw new JVMCIError("cannot convert " + name + " of type " + value.getClass().getSimpleName() + (cppType == null ? "" : " [" + cppType + "]") + " to " + toType.getSimpleName()); |
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320 } |
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321 |
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322 private final HotSpotVMConfigStore store; |
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323 |
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324 public HotSpotVMConfigAccess(HotSpotVMConfigStore store) { |
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325 this.store = store; |
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326 } |
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327 } |